JPS6159701B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for separating raw animal material, such as slaughterhouse offal, into a fat component on the one hand and a protein component on the other hand, the method comprising grinding or grinding. comminuting the raw material in a similar manner and continuously heating this milled material to a first relatively low temperature with the addition of water, preferably using treated water, to rapidly reduce the flow of warmed raw material. The step of heating the material to a second higher temperature and then immediately separating the material into the desired components by one or more stages of centrifugation.

Such methods can be found in various embodiments. In one embodiment of carrying out the method,
The raw material is ground and then sent through a melting pipe into which live steam is injected to bring the raw material to a pumpable density and is equipped with an agitator and a steam coil for heating. It is sent to a storage tank. The stream of raw material from the storage tank is pumped through a heater in which the temperature is increased to a point suitable for subsequent separation in a centrifuge. A slurry rich in fat components on the one hand and proteins on the other hand is obtained from the centrifuge. The fat component is further purified by centrifugation, and the protein component is produced, for example, for feed.

Such facilities have certain drawbacks. It is difficult to obtain a complete heating effect across the flow of raw material without significantly increasing the temperature within the melting pipe. Therefore, if this temperature is lost to high levels, the collagen in the raw material will be converted to gelatin and extracted, which will lead to higher viscosity and the risk of emulsion formation. In fat components,
On the other hand, it means that the state is inappropriate for separation into protein components.

The use of such storage tanks as described above also has difficulties, such as with respect to the uniformity of the flow of the raw material removed from the tank. It is therefore extremely difficult to carry out a mixing operation in such a vessel in such a manner in order to obtain a complete mixing action without further emulsion formation. At the same time, for equipment of the type using the method mentioned at the outset, consideration must be given to mixing some type of liquid into the comminuted raw material so that it can be separated into the desired components. be. This liquid is generally treated water;
that is, returned from the separation stage of the installation. This treated water must be effectively mixed with the subdivided raw material. The concentration or viscosity of the fluid raw material separated by centrifugal action depends on components such as, inter alia, water content and temperature. Controlling this viscosity in conventional facilities has proven difficult.

The object of the invention is to provide a method of the type mentioned at the outset, which does not have the disadvantages associated with previously known methods.

According to the invention, a method of the type mentioned at the outset is characterized in that the heating of the raw material to the first temperature is carried out in one circuit.

By choosing the appropriate circulation rate, thorough mixing can be obtained without forming emulsions. To circulate the material, a pump such as a "monopump" type must be used gently.

The heating operation is carried out by a heater connected in the live steam or secondary steam circuit, thereby ensuring an effective heating action over the flowing raw material without fear of overheating.

In order to reduce the risk of emulsion formation during the heating action in this circuit, the subdivided raw material is heated in this circuit at a first temperature of 40 DEG to 70 DEG C. To facilitate centrifugal separation, the heated raw material exiting this circuit is heated to a second temperature of 85 DEG to 100 DEG C.

One embodiment of the method according to the invention includes the step of adding treated water to the subdivided raw material, the viscosity of which is sensed within the flowing raw material circulating in the circuit, and the viscosity of the raw material being at a constant level. The feed rate of the subdivided raw material to the circuit is controlled in such a way that the feed rate of the subdivided raw material is maintained. Such viscosity sensing can be performed by measuring pressure in the circuit at a constant circulation rate maintained by a positive displacement pump. The feed rate is controlled via a controller, which applies the feed rate to equipment, such as a grinder, used to subdivide the raw material. Since the temperature is kept constant in the circuit, this means that the viscosity of the flowing raw material remains constant even after being heated to a second higher temperature before being subjected to centrifugation; Contributes to obtaining proper results of separation work.

The viscosity is also influenced by the amount of liquid it is suitable to use treated water from the centrifugation operation that is returned to the circuit. Sludge from any other centrifugation of the fat component can also be returned to the circuit to adjust the viscosity of the fluid raw material.

The drawing is a diagrammatic flowchart of an installation for carrying out the method according to the invention, which comprises a crusher 1 for comminuting the raw material, a conveyor 2 for transporting the comminuted raw material, and conduits 6, 7, 8, 9. It thus consists of a circuit comprising a reservoir 3 with a conical bottom, a pump 4 and a heater 5 which are interconnected. A conduit 10 is attached to the circuit and is connected via a pump 11 and a conduit 12 to a heater 13 for injecting live steam. The heater 13 is connected via a first conduit 14 with an outlet conduit 16 for the fat/water mixture.
connected to a centrifuge 15, this conduit 16 being connected to a second
It is coupled to a centrifuge 17. A solid phase material discharge conduit 18 connects from the centrifuge 15 to a solid phase material dryer 19 . The centrifuge 17 has three outlets: 20 for fat, 21 for aqueous phase material and 22 for slurry material. Water phase substance is in conduit 23
and/or back to the dryer 19 via conduit 24. The slurry material is optionally returned to the circuit via conduit 25 or passed to dryer 19 via conduit 26.

A manometer 27 is provided in the circuit for measuring the pressure in the conduit 7.

This equipment works as follows.

The raw material is fed into a crusher 1, subdivided and transferred to a storage tank 3. The pump 4 operates with a capacity of 6 to 12 times the capacity of the raw material container of the installation, which means that the circulation rate in the circuit is high. The heater 5 functions with live steam or secondary steam. Heater 1 is used to quickly raise the temperature to the desired value even with live steam.
3, whereby the fluid raw material is separated directly into a solid phase stream in a centrifuge 15, i.e. dried in a dryer 19, and the fat/water stream still contains a small amount of solid phase material. is separated into fat discharged from the equipment, water and slurry containing insoluble glue substances. Of these, the aqueous phase material and muddy material are returned to the circuit. A portion of the water is sent to the dryer.

The feed rate of the equipment is controlled by reading the manometer 27, which is connected to a controller that automatically controls the raw material.

This equipment is further illustrated by the following example which provides operational documentation.

1000 Kg/h of abattoir bones containing 15% fat, 39% water and 46% other solid substances were sent to the facility. 1400Kg/h of water and 70Kg/h of offal are returned via conduits 23 and 25, with an additional 50Kg/h
of steam was injected into the heater 5, whereby the temperature in the circuit reached 55° to 60°C. An additional 140 kg/h of steam was injected into the heater 13. The temperature of the flow to centrifuge 15 was between 90° and 95°C. A solid material stream of 745 Kg/h is discharged from the centrifuge 15, while a fat/water flow of 1915 Kg/h is produced in the centrifuge 17 with 121 Kg/h of fat, 70 Kg/h of return slurry and 1724Kg/h of water is separated, from which 324Kg/h flows into the dryer 19 and 1400Kg/h of water is separated.
Kg/h was returned. Dryer 19 discharged 525 kg/h of meat and bone material containing 5.5% fat and 10.0% water. This made it possible to obtain the desired low fat content within the meat and bone yield.

[Brief explanation of the drawing]

The drawing is a diagrammatic flowchart of an installation implementing the method according to the invention. 1...Crusher, 2...Conveyor, 3...Storage tank,
4... pump, 5... heater, 6-10... conduit, 11... pump, 12... conduit, 13... heater, 14... conduit, 15... first centrifuge,
16... Outlet conduit, 17... Second centrifuge,
18... Discharge conduit, 19... Dryer, 20... Fatty substance, 21... Water phase substance, 22... Sludge substance,
23, 24, 25, 26... conduit, 27... manometer.

Claims (1)

[Scope of Claims] 1. A method of separating raw animal materials such as slaughterhouse scraps into fat components on the one hand and protein components on the other hand, which process involves grinding or similar methods. The material is subdivided, this milled material is continuously heated to a first relatively low temperature with the addition of water, preferably treated water, and the stream of warmed raw material is rapidly transferred to a second relatively low temperature. It involves the step of heating to a high temperature and then immediately separating this material into the required components by one or more stages of centrifugation, within a circuit in which the subdivided raw material is circulated at a temperature of 45° to
A method for separating animal raw materials, characterized in that heating is performed to a first temperature of 70°C, and then heated to a second temperature of 85° to 100°C. 2. characterized in that the viscosity of the fluid raw material circulating in the circuit is sensed and the velocity of the raw material subdivided into this circuit is controlled in such a way that the viscosity of the fluid raw material is maintained at a constant level. A method for separating animal raw materials according to claim 1.